How to add a watermark to a PDF quickly and easily in 2026. In this tutorial, I'll show you step-by-step how to insert text or image watermarks into your PDF documents using free methods that work on Windows, Mac, and online. This means you can protect your files, brand your documents, and prevent unauthorized use without paying for expensive software. To do this we use a tool I built called PDFGadget. PDFGadget allows you to add watermarks to PDFs for free without installing software or uploading files to servers because it all works in the browser on your computer or mobile device.
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